<html>

<head>
  <title>Express</title>
  <link rel="stylesheet" href="/stylesheets/style.css">
</head>

<body>
  <form action="/api/upload" method="post" enctype="multipart/form-data">
    <div>
      用户名：
      <input type="text" name="uid">
    </div>
    <div>
      头像:
      <button type="button" name="selectPic">请选择....</button>
      <input type="file" name="pic" multiple style="display:none">
    </div>
    <div>
      照片：
      <input type="file" name="img" multiple>
    </div>
    <button type="submit">提交</button>
  </form>

  <script>
    const form = document.forms[0];

    form.selectPic.onclick = function () {
      form.pic.click();
    }
    form.pic.onchange = function () {
      form.selectPic.innerHTML = this.value;

    }
  </script>
</body>

</html>